No missable achievements (plus 11 unknown)
Sign in with Steam or Xbox to track your progress, and:
Finish a level with one life.
Defeat Nestor in less than 3 minutes.
Defeat Nestor without using the Megablast weapon.
Own 4 fully upgraded weapons.
Take no hits on any level.
Absorb 1000 bullets with your shield.
Be careful when playing with fire.
Find the hidden levels.
Die exactly 42 times during the whole game.
Defeat the malfunctioning Space Machine.
Kill no enemies except bosses.